Cities with low centralized treatment rate of urban sewage are: Changchun, Harbin, Wuhan, Zhanjiang, Beihai, Chongqing, Lhasa; cities with relatively low rate of harmless treatment of domestic waste are: Harbin, Urumqi, Guiyang; cities with zero centralized treatment of hazardous wastes (specifically referring to the centralized disposal of medical wastes has not yet been built) are: Beijing, Shanghai, Yantai, Lhasa, Xi'an, Yinchuan.